DrawArc in C# with IF statement

{

         g.DrawArc(pn, rect, 12, 84);

}

But when I am adding the If statement to the code I cannot see any Arc on the form( there is no error in debugging  but there is a problem with showing the results):

public int m=10;

private void pictureBox1_Paint(object sender, PaintEventArgs e)

         if (m == 10)

            Graphics g = e.Graphics;

               Pen pn = new Pen(Color.Blue);

               Rectangle rect = new Rectangle(50, 50, 200, 100);